https://www.youtube.com/watch?v=EgEfRxWPPw8 basic 1-6
§ https://www.youtube.com/watch?v=v5KjVRYZB2A Part of Ted talk
https://www.youtube.com/watch?v=2eMBw3yiO_4
https://www.youtube.com/watch?v=Fbyc9JW3vtk intro to vortex math
http://www.markorodin.com/ his web site
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